Seth Rogen can't believe Catherine O'Hara is gone. Hours after the news that the 71-year-old actress died on Friday following "a brief illness," he took to Instagram to mourn. Perezcious readers know that the pair starred on The Studio. Filming for season two of the show reportedly began last week, but Catherine couldn't come in for her few scenes due to "personal matters." A source for The Sun said that no one knew " she was dealing with any health or major issues," so her death came "as a total shock to everyone on the show.